Add CI compilation phase with clang 3.8

This uses CodeBuild to run in parallel

Author: romainbrenguier

buildspec-linux-clang-3.8.yml

@@ -0,0 +1,27 @@
+version: 0.2
+
+env:
+  variables:
+    # CodeBuild console doesn't display color codes correctly
+    TESTPL_COLOR_OUTPUT: 0
+
+phases:
+  install:
+    commands:
+      - sed -i 's#/archive.ubuntu.com#/us-east-1.ec2.archive.ubuntu.com#g' /etc/apt/sources.list
+      - apt-get update -y
+      - apt-get install -y clang-3.8 flex bison make git libwww-perl patch ccache libc6-dev-i386 jq openjdk-8-jdk
+  build:
+    commands:
+      - echo Build started on `date`
+      - git submodule update --init --recursive
+      - make -C src CXX='ccache /usr/bin/clang++-3.8' CXX_FLAGS='-Qunused-arguments -DDEBUG'
+      - make -C jbmc/src CXX='ccache /usr/bin/clang++-3.8' CXX_FLAGS='-Qunused-arguments -DDEBUG'
+  post_build:
+    commands:
+      - echo Build completed on `date`
+cache:
+  paths:
+    - '/var/cache/apt/**/*'
+    - '/var/lib/apt/lists/**/*'
+    - '/root/.ccache/**/*'